1) Classification of bacteria on the bases of nutritional requirement
Nutrition is substances used in biosynthesis and energy production and
therefore are required for all living things.
Bacteria, like all living cells, require energy and nutrients to build proteins
and structural membranes and drive biochemical processes.
Bacteria require sources of carbon, nitrogen, phosphorous, iron and a large
number of other molecules.
Carbon, nitrogen, and water are used in the highest quantities.
The nutritional requirements for bacteria can be grouped according to the
carbon source and the energy source.
Some types of bacteria must consume pre-formed organic molecules to
obtain energy, while other bacteria can generate their own energy from
inorganic sources.
It can be classified as
Autotrophs
Organisms that obtain carbon from carbon dioxide and use light energy or
inorganic chemical compounds to produce complex organic compounds are
known as autotrophs. These are bacteria that can synthesise their own food from
inorganic compounds.
Autotrophic bacteria are further classified into two:
Photoautotroph
Photoautotrophic bacteria use CO2 as their carbon source to convert it into
carbohydrates in the presence of sunlight.
These bacteria have pigments in their photosystems.
Example: cyanobacteria, purple sulphur bacteria and green sulphur bacteria.
Nutrition is substances used in biosynthesis and energy production and
therefore are required for all living things.
Bacteria, like all living cells, require energy and nutrients to build proteins
and structural membranes and drive biochemical processes.
Bacteria require sources of carbon, nitrogen, phosphorous, iron and a large
number of other molecules.
Carbon, nitrogen, and water are used in the highest quantities.
The nutritional requirements for bacteria can be grouped according to the
carbon source and the energy source.
Some types of bacteria must consume pre-formed organic molecules to
obtain energy, while other bacteria can generate their own energy from
inorganic sources.
It can be classified as
Autotrophs
Organisms that obtain carbon from carbon dioxide and use light energy or
inorganic chemical compounds to produce complex organic compounds are
known as autotrophs. These are bacteria that can synthesise their own food from
inorganic compounds.
Autotrophic bacteria are further classified into two:
Photoautotroph
Photoautotrophic bacteria use CO2 as their carbon source to convert it into
carbohydrates in the presence of sunlight.
These bacteria have pigments in their photosystems.
Example: cyanobacteria, purple sulphur bacteria and green sulphur bacteria.
